In every Generation, no Pokémon has beaten Eevee in terms of evolution - Tyrogue came close in Gen II and III, though, in that it can evolve into the three Hitmons. But Eevee has 8, and so far, I don't see a Pokémon beating that.

As for what type Sylveon is, some people speculate it to be Bug or Normal type, or even Light-type.

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I used to be casually ready... for Battle!Apparently an ever-cute Pikachu in Dungeons and Dragonites

As KarjamP said, X and Y's names are based on the chromosomes (the X and Y chromosomes, obviously). Both of them are sex chromosomes, which determine the sex (or gender) of an individual. Possibly to remove that reference, the English guys removed the double helix, because I doubt they'd allow that word in other translations.

I have had it with Nintendo, Game freak, and Pkmn. I just hate the things they come up with now. OK, Zekrom, Reshiram, and Kyurem were ok till BW1. BW2 made them combine, so now Kyurem has butt drills/thrusters, random pipes all over his body, huge wings....... WTH NINTENDO. And then the Kami Trio, Genesect, Swords of Justice. Not Meloetta and Victini though. And now this Mewthree makes the most ridiculous step in history of PKMN.

CoroCoro has revealed that the new Pokemon we saw last week is in fact a new form of Mewtwo, as predicted.

...Okay, so Mewtwo merely gets a new form... five generations after Mewtwo was released. I guess it's because of the 16th Pokémon movie ("Extreme Speed Genesect: Mewtwo's Awakening") though. Maybe it's his "Awakened Forme". But still, seriously?

...

I'll forgive them if they reveal a cute Pokémon before my birthday....But now I wonder... does this mean that there's a chance Mew can get a new form too? Or is that just a pipe dream?

... They still should decide whether Phione is a Legendary or not. I guess not even Game Freak knows...

They're Starter Pokémon, not Legendaries. And the Starters are already known, so they don't count towards me forgiving Game Freak...

If all they're going to do until the release of X and Y is revealing new forms of old Pokémon while hiding most of the truly new ones, they'd better give Shaymin a Sea Forme. Seriously, that cute Pokémon has a Sky and a Land Forme.

Is the new form Psychic/Electric? Or is it pure Psychic? Or pure Electric? May Game Freak answer soon. Hopefully before June.

...

Wonder if they'll introduce a new type and create a new form for Arceus, though? Not likely, except for counter-hacking measures (as with the ??? type). Because then the Arceus movie would be a lie (in that 16 Plates and not 17)

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I used to be casually ready... for Battle!Apparently an ever-cute Pikachu in Dungeons and Dragonites

More news. I quoted this post from Taylor at the Dragon Riders Planning Forums.

Taylor wrote:

More new Pokémon are made known, by the looks of things.

"Noivern" sounds weird, in my opinion. Wonder what it's based on...? But it'll have a new attack called "Boomburst" apparently."Vivilion" sounds as though it's related to Cobalion, Terrakion, Virizion and Keldeo. But it's not, apparently it's a butterfly.